Arabidopsis protein kinase PKS5 inhibits the plasma membrane H+ -ATPase by preventing interaction with 14-3-3 protein
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Arabidopsis protein kinase PKS5 inhibits the plasma membrane H+ -ATPase by preventing interaction with 14-3-3 protein. / Fuglsang, Anja Thoe; Guo, Yan; Cuin, Tracey A.; Qiu, Quansheng; Song, Chunpeng; Kristiansen, Kim Anker; Bych, Katrine; Schulz, Alexander; Shabala, Sergey; Schumaker, Karen S.; Palmgren, Michael Gjedde; Zhu, Jian-Kang.
In: Plant Cell, Vol. 19, No. 5, 2007, p. 1617-1634.Research output: Contribution to journal › Journal article › Research › peer-review
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T1 - Arabidopsis protein kinase PKS5 inhibits the plasma membrane H+ -ATPase by preventing interaction with 14-3-3 protein
AU - Fuglsang, Anja Thoe
AU - Guo, Yan
AU - Cuin, Tracey A.
AU - Qiu, Quansheng
AU - Song, Chunpeng
AU - Kristiansen, Kim Anker
AU - Bych, Katrine
AU - Schulz, Alexander
AU - Shabala, Sergey
AU - Schumaker, Karen S.
AU - Palmgren, Michael Gjedde
AU - Zhu, Jian-Kang
PY - 2007
Y1 - 2007
N2 - Regulation of the trans-plasma membrane pH gradient is an important part of plant responses to several hormonal andenvironmental cues, including auxin, blue light, and fungal elicitors. However, little is known about the signalingcomponents that mediate this regulation. Here, we report that an Arabidopsis thaliana Ser/Thr protein kinase, PKS5, is anegative regulator of the plasma membrane proton pump (PM Hþ-ATPase). Loss-of-function pks5 mutant plants are moretolerant of high external pH due to extrusion of protons to the extracellular space. PKS5 phosphorylates the PM Hþ-ATPaseAHA2 at a novel site, Ser-931, in the C-terminal regulatory domain. Phosphorylation at this site inhibits interaction betweenthe PM Hþ-ATPase and an activating 14-3-3 protein in a yeast expression system. We show that PKS5 interacts with thecalcium binding protein SCaBP1 and that high external pH can trigger an increase in the concentration of cytosolic-freecalcium. These results suggest that PKS5 is part of a calcium-signaling pathway mediating PM Hþ-ATPase regulation.
AB - Regulation of the trans-plasma membrane pH gradient is an important part of plant responses to several hormonal andenvironmental cues, including auxin, blue light, and fungal elicitors. However, little is known about the signalingcomponents that mediate this regulation. Here, we report that an Arabidopsis thaliana Ser/Thr protein kinase, PKS5, is anegative regulator of the plasma membrane proton pump (PM Hþ-ATPase). Loss-of-function pks5 mutant plants are moretolerant of high external pH due to extrusion of protons to the extracellular space. PKS5 phosphorylates the PM Hþ-ATPaseAHA2 at a novel site, Ser-931, in the C-terminal regulatory domain. Phosphorylation at this site inhibits interaction betweenthe PM Hþ-ATPase and an activating 14-3-3 protein in a yeast expression system. We show that PKS5 interacts with thecalcium binding protein SCaBP1 and that high external pH can trigger an increase in the concentration of cytosolic-freecalcium. These results suggest that PKS5 is part of a calcium-signaling pathway mediating PM Hþ-ATPase regulation.
U2 - 10.1105/tpc.105.035626
DO - 10.1105/tpc.105.035626
M3 - Journal article
C2 - 17483306
VL - 19
SP - 1617
EP - 1634
JO - The Plant Cell
JF - The Plant Cell
SN - 1040-4651
IS - 5
ER -
ID: 8071155